Pipe expansion vs water hammer
Slow temperature movement creates ticking; rapid pressure change creates impacts.
↔Pipe thermal expansion
VS!Rapid valve closure
Typical location
Pipe penetrations, clips and framing contacts
Pressurized water pipes near quick-closing valves
Timing fingerprint
As heating warms or cools
Immediately when a valve or appliance closes
Visible or audible pattern
Light repeated ticks, rubbing or creaks
One or more sharp impacts
Best separating check
Correlate exact sound timing with temperature change
Identify the exact fixture that triggers the bang
Evidence that weakens it
One sharp bang at valve closure
Slow ticking throughout heating cycle
The rule
Use this comparison in Clue Engine →Do not repair the resemblance. Verify the pathway.
Color and shape can overlap. Timing, location and a repeatable check usually carry more diagnostic weight.
